Rubber mat for a watercraft



FIG. 1 is an enlarged fractional bottom view of the rubber mat for a watercraft of my design, with a middle section removed;

FIG. 2 is an enlarged front view of the rubber mat for a watercraft of my design which is identical to the rear view;

FIG. 3 is an enlarged fractional top view of the rubber mat for a watercraft of my design, with a middle section removed;

FIG. 4 is an enlarged side view of the rubber mat for a watercraft of my design, with a middle section removed; and,

FIG. 5 is a bottom view of the rubber mat for a watercraft of my design. 

The ornamental design for a rubber mat for a watercraft, as shown and described. 